February 2013 DocID023317 Rev 2 1/5
5
STEVAL-IHM037V1
Ceiling fan remote control unit based on the STM8 microcontroller
Data brief
Features
•Operating voltage: 180-250 VAC
•Low-cost capacitive power supply for the
STM8S003F3 (receiver), and CR2032 coin cell
battery for the STM8L101F2 (IR remote)
•Triac-based speed control with firing angle
•IR receiver for speed control through RC5
remote
•Two pushbuttons for speed change
•RoHS compliant
Description
The STEVAL-IHM037V1 demonstration board
implements speed control for an induction motor-
based ceiling fan using a remote control.
Traditionally, fan speed is controlled using a Triac-
based regulator, which must be operated
manually.
The STEVAL-IHM037V1 replaces the manual
regulator with a remote control-based solution.
Two pushbuttons are also provided to increase or
decrease fan speed. Speed is regulated by
controlling the firing angle of a Triac (T435x) with
the STM8S003x microcontroller.
www.st.com
Schematic diagram STEVAL-IHM037V1
2/5 DocID023317 Rev 2
1 Schematic diagram
Figure 1. STEVAL-IHM037V1 circuit schematic (1 of 2)
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DocID023317 Rev 2 3/5
STEVAL-IHM037V1 Schematic diagram
Figure 2. STEVAL-IHM037V1 circuit schematic (2 of 2)
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DocID023317 Rev 2 5/5
STEVAL-IHM037V1
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